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$\"\"$ $\"\"$ $\"\"$

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The equations are

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$\"\"$ (Equation(1)

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$\"\"$ (Equation(2)

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Solve the second equation for j in terms of k.

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$\"\"$ (Subtract j from each side).

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$\"\"$ (Apply Commutative property: $\"\"$ )

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$\"\"$ (Apply Additive inverse property: $\"\"$ )

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$\"\"$ (Apply Additive identity property: $\"\"$ )

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$\"\"$

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Substitute $\"\"$ in Equation (1).

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$\"\"$

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$\"\"$ (ApplyDistributive property: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Apply Commutative property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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$\"\"$ (Add 42 to each side)

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$\"\"$ (Apply Additive inverse property: $\"\"$ )

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$\"\"$ (Apply Additive identity property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$

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$\"\"$ (Divide each side by 5)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$

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Substitute $\"\"$ in equation in equation $\"\"$ .

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$\"\"$

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$

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The solution is $\"\"$ .

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